Anyone have any idea what this part is?

[99xcss4]

I can not figure it out is he asking about the distributor or parts on the distributor

 

[AuroraGirl]

Rotate the gear on the bottom slowly and try to see if you can feel magnetic poles align, such that it gets easier and then back to harder to turn, if you can tell this, its good. if not ,the pickup is bad

 

[GoToGuy]

Is this an April fools joke, cause it's a little early.